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Table 1 Baseline demographic and clinical characteristics of patients in the complete dataset. Continuous variable values are represented as means (standard deviation). Dichotomous variable values are represented as numbers (percentages)

From: The effectiveness of shared decision-making followed by positive reinforcement on physical disability in the long-term follow-up of patients with nonspecific low back pain in primary care: a clustered randomised controlled trial

  intervention group control group
Patient characteristics (n = 112) (n = 114)
mean age (years) 45.4 (13.2) 44.3 (14.4)
male† 52 (47%) 55 (49%)
Dutch origin‡ 97 (91%) 103 (93%)
educational level‡
 primary only 15 (14%) 19 (17%)
 secondary 56 (52%) 53 (48%)
 college, university 36 (34%) 39 (35%)
employed§ 73 (70%) 71 (70%)
Baseline clinical characteristics
functional disability score (RMD 0–24) (primary measure)¶ 10.7 (5.0) 10.3 (5.2)
pain severity at baseline (VAS 0–100 mm)|| 48.6 (16.0) 46.7 (16.7)
absenteeism (yes/no)|| 39 (35%) 19 (20%)
illness perception dimensions (IPQ)(0–10)§   
consequences 6.3 (2.3) 6.1 (2.5)
timeline 4.2 (2.8) 3.5 (2.4)
personal control 5.0 (2.2) 5.4 (2.1)
treatment control 6.6 (1.9) 6.9 (1.9)
identity 6.9 (1.6) 7.2 (1.6)
concerns 4.5 (2.5) 4.8 (2.6)
illness comprehensibility 6.0 (2.3) 6.1 (2.3)
emotional response 5.0 (2.5) 5.2 (2.6)
  1. RMD = Roland-Morris disability questionnaire (a higher score indicates a more favourable outcome). VAS = visual analogue scale combined score of low back pain, leg pain and both (a lower score indicates a more favourable outcome). IPQ = Illness Perception Questionnaire. ¶ n = 3 missing. || n = 34 missing. † n = 4 missing. ‡ n = 8 missing. § n = 19 missing